Year of Publication

2015

Degree Name

Master of Science in Mechanical Engineering (MSME)

Document Type

Master's Thesis

College

Engineering

Department

Mechanical Engineering

First Advisor

Dr. Kozo Saito

Abstract

The disintegration of a liquid jet emerging from a nozzle by a high speed gas stream has been under investigation of several decades. A result of the liquid jet disintegration is droplet formation. This process is referred to as atomization. Industrial applications use atomization as a method for applying coatings to substrates. It has been reported that the use of other atomizing gases instead of compressed plant air will positively affect paint droplet size distributions, spray patterns and finish qualities; furthermore, the ionization and heating of the atomizing gas was reported to positively affect finish qualities. Although ionization techniques have been studied in the past, a lack of specific information remains about how ionization actually affects droplet formation and size, and finish quality.

To determine the effect of the different atomizing gases, heating, and ionization several methods were used. The droplet size distribution of the spray was captured with the use of laser diffraction, while the large-scale characteristics of the flow were recorded with Infrared thermography. In the process, a novel method was developed for measuring the secondary droplet breakup in the spray.

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